how to call async inside another async - node.js

Question

I am trying to get some data using an API with an accessToken which is encrypted in the database, I am fetching it then decrypting so I can use it to make the API call as follows:
async function getUserGuilds(discord_id) {
//Get Token
const tokenQuery = 'SELECT e_accesstoken FROM users WHERE discord_id = $1';
const discordID = [discord_id];
db.query(tokenQuery, discordID, (err, res) => {
if (err) {
console.log(err);
} else if (!err) {
const encryptedAccessToken = res.rows[0].e_accesstoken
const decrypted = decrypt(encryptedAccessToken);
const accessToken = decrypted.toString(CryptoJS.enc.Utf8);
}
})
//Call the API after getting the token
const response = await fetch(`${DISCORD_API}/users/#me/guilds`, {
method: 'GET',
headers: {
Authorization: `Bearer ${accessToken}`
}
});
return response.json();
}
as you can see the accessToken is outside the scope, how can I access it and use it for the API call? What is the best practice?

Answer 1

// Since you are using async keywork, this function automatically returns
// a Promise, therefore you will need to handle it with a .then() or await
// in order to get the result.
async function getUserGuilds(discord_id) {
return new Promise((resolve, reject) => {
//Get Token
const tokenQuery = 'SELECT e_accesstoken FROM users WHERE discord_id = $1';
const discordID = [discord_id];
db.query(tokenQuery, discordID, async (err, res) => {
if (err) {
console.log(err);
// Rejecting the promise error here will stop the execution, therefore you will not need to
// add an else statement
return reject(error);
}
const encryptedAccessToken = res.rows[0].e_accesstoken
const decrypted = decrypt(encryptedAccessToken);
const accessToken = decrypted.toString(CryptoJS.enc.Utf8);
// Always wrap async operations with try/catch because they will fail
// at some point, therefore your code must be prepared to handle it
try {
//Call the API after getting the token
const response = await fetch(`${DISCORD_API}/users/#me/guilds`, {
method: 'GET',
headers: { Authorization: `Bearer ${accessToken}` }
});
resolve(response.json());
} catch (error) {
reject(error);
}
});
});
}
The tip is, as soon you start to dealing with asynchronous code, try to write you own functions in an asynchronous manner.